Two parents and their teen daughter were arrested for throwing a booze-fueled party for high school students.

Authorities said that Geoffrey Boylan, 39, not only provided alcohol for his daughter’s friends, but had sexual relations with one of her 16-year-old classmates at his home in Williamsburg, Michigan.

Boylan will not be charged with criminal sexual misconduct because the girl was of age, according to the Grand Traverse County Attorney’s Office.

“There’s a difference between something that’s morally or ethically wrong and something that violates the criminal law,” Grand Traverse County Prosecutor Bob Cooney told the Record-Eagle. “Given the age difference between the two and the circumstances of this case, I certainly can’t condone what happened but at the same time, it did not violate criminal law.”

He and his wife Duanne Boylan, 37, were charged on Wednesday with furnishing alcohol to minors. Duanne also faces charges for allowing minors to consume alcohol in her home.

Their 18-year-old daughter Hannah Boylan faces one count of both of the charges.

According to the Record-Eagle, the 18-year-old collected money from her friends for beer supplied by her parents at the March 3 party. Party-goers told investigators that they smoked pot and played drinking games at the home.

Her father maintained in March that he did not throw the party.

“I did not (have a party),” Geoffrey Boylan told the Record-Eagle. “There was a party at my house that my child had.”

He admitted to authorities that he had sexual relations with a teen girl who he spotted on the couch early on the morning of the party. She allegedly performed oral sex on him, but he said he stopped her during the encounter, telling her it “wasn’t right.”

The teen girl told investigators that the sex act was consensual, but wouldn’t have likely happened if she hadn’t been drunk.

Geoffrey, who volunteered as a Elk Rapids Schools assistant football coach, was asked by the district not to return.

District Superintendent Stephen Prissel said the 39-year-old father “has no business being around kids.”